A Relational Database Management System (RDBMS) is a program used to create, update, and manage relational databases. Relational databases store data in tables, which are related to each other based on data common to each. An RDBMS includes functions that maintain the security, accuracy, integrity, and consistency of the data. The RDBMS is the most popular database system among organizations across the world, providing a dependable method of storing and retrieving large amounts of data while offering a combination of system performance and ease of implementation.

Most RDBMSs use SQL (Structured Query Language) to access the data in tables. SQL is a language that provides an internally consistent mathematical language that makes it easier to improve the performance of all database queries. SQL is used to write and query data in a database, and it is widely used as the language for database queries.

Examples of popular RDBMS systems include MySQL, PostgreSQL, MariaDB, Microsoft SQL Server, and Oracle Database. Relational databases are used by organizations of all types and sizes for a broad variety of information needs, such as tracking inventories, processing e-commerce transactions, managing huge amounts of mission-critical customer information, and much more.